Opposed reciprocating pump

Abstract

The invention relates to the technical field of reciprocating plunger pumps, and discloses an opposed reciprocating pump which comprises a transmission end and fluid ends arranged on the left side and the right side of the transmission end, the transmission end comprises a machine body, a crankshaft, a connecting rod and a crosshead, the crankshaft, the connecting rod and the crosshead are installed on the machine body, the crankshaft comprises a plurality of crank throws, and the crank throws are installed on the machine body. Each crank throw is provided with the two connecting rods, the two connecting rods extend along the left side and the right side of the crankshaft respectively to be connected with the crossheads located on the left side and the right side of the crankshaft, and the crossheads are connected with plungers corresponding to the fluid ends. The high-pressure large-flow reciprocating pump is more reasonable and compact in overall structure, the crankshaft has good rigidity, a lubricating system is simple, and the high-pressure large-flow reciprocating pump is low in cost, high in reliability and high in maintainability.

Description

Technical Field

[0001] The present application relates to the technical field of reciprocating piston pumps, and in particular to an opposed reciprocating pump. Background Art

[0002] Reciprocating pumps are positive displacement pumps that use the periodic changes in the volume of the working chamber to transport liquids. There are many types of reciprocating pumps, which can be divided into motorized pumps, direct-acting pumps, and manual pumps according to the drive mode; they can be divided into horizontal pumps, vertical pumps, angular pumps, and opposed pumps according to the position of the center line of the piston (plunger). Motorized pumps are usually composed of a hydraulic end, a transmission end, a reducer, a prime mover, and other ancillary equipment (lubrication, cooling system, etc.). The transmission end refers to the component from the crosshead to the power input end of the main shaft (crankshaft), which is mainly composed of a body, a crankshaft, a connecting rod, a crosshead, lubrication, cooling, etc. An opposed pump is a pump that arranges the two hydraulic ends symmetrically on both sides of the same transmission end. The main shaft has good rigidity and a compact structure.

[0003] There are also many differences in the transmission end layout and body structure of opposed reciprocating pumps. The hydraulic end can be divided into symmetrical and asymmetrical, which is mainly caused by different connecting rod structures and arrangements. The symmetrical hydraulic end can adopt structures such as forked connecting rods, integral eccentric slider connecting rods, and articulated connecting rods. The forked connecting rod is not convenient for disassembly and lubrication. The integral eccentric slider connecting rod has a complex structure and it is difficult to guarantee the service life. The different flow waveforms on both sides of the articulated connecting rod affect the flow pulsation rate. The asymmetrical hydraulic end can adopt parallel connecting rods and adjacent connecting rod layouts. However, the number of crankshaft turns of the adjacent connecting rod scheme is equal to the number of pistons (plungers), which is not compact enough and the crankshaft stiffness is not good. Summary of the invention

[0004] The present application aims to provide an opposed reciprocating pump to solve the technical problems of the opposed reciprocating pump in the prior art, such as complex structure, poor rigidity and high cost.

[0005] In order to solve the above-mentioned technical problems, an embodiment of the present application provides an opposed reciprocating pump, including a transmission end and a hydraulic end arranged on the left and right sides of the transmission end, the transmission end includes a body, a crankshaft, a connecting rod and a crosshead, the crankshaft, the connecting rod and the crosshead are installed on the body, the crankshaft includes a plurality of cranks, each of the cranks is equipped with two connecting rods, the two connecting rods extend along the left and right sides of the crankshaft respectively and are connected to the crossheads located on the left and right sides of the crankshaft, and the crosshead is connected to the plunger corresponding to the hydraulic end.

[0006] In some embodiments, the large end of the connecting rod is connected to the crankshaft through a bearing, and the small end of the connecting rod is connected to the crosshead through a pin.

[0007] In some embodiments, the machine body is provided with a crankshaft hole for installing the crankshaft, the crankshaft hole includes a first crankshaft hole provided at the front and rear ends of the machine body and at least one second crankshaft hole provided in the machine body, an end bearing seat is provided at the first crankshaft hole, an intermediate bearing seat is provided in the machine body, and the intermediate bearing seat has the second crankshaft hole.

[0008] In some embodiments, the crankshaft is connected to the end bearing seat via an end bearing, the crankshaft is connected to the intermediate bearing seat via an intermediate bearing, the end bearing is a spherical roller bearing, and the intermediate bearing is a floating cylindrical roller bearing.

[0009] In some embodiments, an expansion sleeve is further provided between the crankshaft and the end bearing.

[0010] In some embodiments, the intermediate bearing seat is a semi-arc structure and is arranged on one side of the crankshaft. The machine body also includes a bearing cover arranged on the other side of the crankshaft. The bearing cover is docked with the intermediate bearing seat and connected to the intermediate bearing.

[0011] In some embodiments, the phase angles of the plurality of cranks are different.

[0012] In some embodiments, the large end of the connecting rod is an obliquely split structure.

[0013] In some embodiments, a crosshead slide is provided in the body, and the crosshead is disposed in the crosshead slide and reciprocates along the crosshead slide.

[0014] In some embodiments, the left and right ends of the machine body are respectively provided with connecting plates connected to the hydraulic end.

[0015] The opposed reciprocating pump provided in the embodiment of the present application is configured to include a transmission end and a hydraulic end arranged on the left and right sides of the transmission end, wherein the transmission end includes a body, a crankshaft, a connecting rod and a crosshead, wherein the crankshaft, the connecting rod and the crosshead are installed on the body, the crankshaft includes a plurality of cranks, each of which is equipped with two connecting rods, the two connecting rods extend along the left and right sides of the crankshaft respectively and are connected to the crossheads located on the left and right sides of the crankshaft, the crosshead is connected to the plunger corresponding to the hydraulic end, and an asymmetric opposed reciprocating pump structure can be formed by using a plurality of connecting rods installed on the same crank. The overall structure is more reasonable and compact, the crankshaft has good rigidity, and the lubrication system is simple, thereby providing a low-cost, high-reliability, and high-maintenance high-pressure and large-flow reciprocating pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic structural diagram of an opposed reciprocating pump according to an embodiment of the present application;

[0018] Figure 2 A top view of an opposed reciprocating pump according to an embodiment of the present application;

[0019] Figure 3 A top cross-sectional view of an opposed reciprocating pump according to an embodiment of the present application;

[0020] Figure 4 It is a schematic structural diagram of the body of an opposed reciprocating pump according to an embodiment of the present application;

[0021] Figure 5 A schematic structural diagram of a crankshaft of an opposed reciprocating pump according to an embodiment of the present application;

[0022] Figure 6 This is a schematic structural diagram of the connecting rod of the opposed reciprocating pump according to an embodiment of the present application.

[0023] Reference numerals:

[0024] 10-transmission end, 1-machine body, 11-first crankshaft hole, 12-second crankshaft hole, 13-end bearing seat, 14-intermediate bearing seat, 15-bearing cover, 16-crosshead slideway, 17-connecting plate, 2-crankshaft, 21-crank, 22-crank arm, 23-main journal, 3-connecting rod, 31-connecting rod big end, 311-facet, 32-connecting rod small end, 4-crosshead, 5-bearing shell, 6-pin shaft, 71-end bearing, 72-intermediate bearing, 8-expansion sleeve; 20-hydraulic end, 201-plunger. DETAILED DESCRIPTION

[0025] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0026] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0028] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0029] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0030] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0031] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0032] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0033] Figures 1 to 6 The structure diagram of the opposed reciprocating pump of the embodiment of the present application is shown. Figures 1 to 6 As shown, an embodiment of the present application provides an opposed reciprocating pump, including a transmission end 10 and a hydraulic end 20 arranged on the left and right sides of the transmission end 10, the transmission end 10 includes a body 1, a crankshaft 2, a connecting rod 3 and a crosshead 4, the crankshaft 2, the connecting rod 3 and the crosshead 4 are installed on the body 1, the crankshaft 2 includes a plurality of cranks 21, each of the cranks 21 is equipped with a plurality of connecting rods 3, the plurality of connecting rods 3 extend along the left and right sides of the crankshaft 2 respectively and are connected to the crosshead 4 located on the left and right sides of the crankshaft 2, and the crosshead 4 is connected to the plunger 201 corresponding to the hydraulic end 20.

[0034] Specifically, Figure 5As shown, the left and right crank arms 22 and the left and right main journals 23 of the crankshaft 2 form a crank throw 21, and the crankshaft 2 is composed of a plurality of crank throws 21. Figure 2 and Figure 3 As shown, two connecting rods 3 are installed on each crankshaft 21, one of which extends along the left side of the crankshaft 2 and is connected to the crosshead 4 on the left side of the crankshaft 2, and the other connecting rod 3 extends along the right side of the crankshaft 2 and is connected to the crosshead 4 on the right side of the crankshaft 2. Since the two connecting rods 2 are arranged at different positions along the axial direction of the crankshaft 21, the plungers 201 on the left and right sides of the crankshaft 21 are located at different positions before and after the transmission end 10, providing an asymmetric opposed reciprocating pump. For example, in this embodiment, each crankshaft 2 includes 5 crankshafts, and each crankshaft is provided with 2 connecting rods 3, so as to be connected to 10 plungers 201 accordingly, forming a five-crank ten-plunger structure. The 10 plungers 201 are arranged one by one in a staggered manner along the front and rear direction of the transmission end 10, so that the overall structure is more reasonable and compact, and the main shaft (crankshaft 2) has good rigidity and a simple lubrication system; at the same time, a single crankshaft 21 can be connected to multiple connecting rods 3, and then connected to multiple plungers 201, so as to provide a low-cost, high-reliability, high-maintenance high-pressure and large-flow reciprocating pump.

[0035] In some embodiments, the large end of the connecting rod 3 (connecting rod big end 31) is connected to the crank 21 through a bearing 5, and the small end of the connecting rod 3 (connecting rod small end 32) is connected to the crosshead 4 through a pin 6, and the connection is reliable and convenient.

[0036] In some embodiments, the body 1 is provided with a crankshaft hole for installing the crankshaft 2, and the crankshaft hole includes a first crankshaft hole 11 arranged at the front and rear ends of the body 1 and at least one second crankshaft hole 12 arranged in the body 1, and an end bearing seat 13 is provided at the first crankshaft hole, and an intermediate bearing seat 14 is provided in the body 1, and the intermediate bearing seat 14 has the second crankshaft hole 12.

[0037] In this embodiment, a corresponding number of second crankshaft holes 12 and intermediate bearing seats 14 can be provided in the machine body 1 as needed to ensure the rigidity of the crankshaft 2, reduce the overall weight of the machine body 1, and reduce the cost of the reciprocating pump; at the same time, the end bearing seats 13 provided at the front and rear ends of the machine body 1 ensure that the crankshaft 2 is firmly connected. For example, in this embodiment, two intermediate bearing seats 14 are provided in the machine body 1, and form four supports with the two end bearing seats 13 at the front and rear ends of the machine body 1.

[0038] In this embodiment, the staggered angle design and support form of the crankshaft crank (including the crankshaft 2 and the connecting rod 3) give full play to the structural advantages of the opposed reciprocating pump, reducing the force and internal stress of the crankshaft 2, the body 1 and the bearings.

[0039] In some embodiments, the crankshaft 2 is connected to the end bearing seat 13 through an end bearing 71, and the crankshaft 2 is connected to the intermediate bearing seat 14 through an intermediate bearing 72. The end bearing 71 is a spherical roller bearing, and the intermediate bearing is a floating cylindrical roller bearing 72, thereby ensuring that the crankshaft 2 is reliably connected.

[0040] In some embodiments, an expansion sleeve 8 is further provided between the crankshaft 2 and the end bearing 71 to facilitate disassembly and assembly and ensure that the overall structure is compact and reliable.

[0041] In some embodiments, Figure 2 and Figure 4 As shown, the intermediate bearing seat 14 is a semi-arc structure and is arranged on one side of the crankshaft 2. The body 1 also includes a bearing cover 15 arranged on the other side of the crankshaft 2. The bearing cover 15 is also a semi-arc structure. The bearing cover 15 is docked with the intermediate bearing seat 14 to surround the crankshaft 2, and the bearing cover 15 is connected to the intermediate bearing 72, which facilitates the disassembly and assembly of the crankshaft 2 while ensuring the reliable connection of the crankshaft 2.

[0042] In some embodiments, the phase angles of the plurality of cranks 21 are different.

[0043] like Figure 5 As shown, the crankshaft 2 has five cranks 21, the crank stagger angle is 144°, and starting from the left input end, the phase angle of the first crank is 0°, the phase angle of the second crank is 144°, the phase angle of the third crank is 288°, the phase angle of the fourth crank is 72°, and the phase angle of the fifth crank is 216°. The phase angle of the first crank can also be other angles, or the crank stagger angle is -144°.

[0044] In a specific implementation, different phase angles can be set for different bends 21. For example, three bends and two supports, the bend staggered angles are sequentially spaced 120°; five bends and four supports, the bend staggered angles are sequentially spaced 144°; seven bends and three supports, the bend staggered angles are Δ, 0x, 2x, 4x, Δ, 6x, 1x, 3x, 5x, Δ, x = 2 / 7*360°; seven bends and four supports, the bend staggered angles are Δ, 0x, 3x, Δ, 5x, 1x, Δ, 4x, 6x, 2x, Δ, x = 2 / 7*360°.

[0045] like Figure 6 As shown, the large end of the connecting rod 3 is an obliquely split structure, that is, the split surface 311 of the large end 31 of the connecting rod forms an angle of 30 to 60 degrees with the axis of the connecting rod body, so that the connecting rod 3 can be easily disassembled and assembled through the cylinder.

[0046] like Figure 4As shown, a crosshead slideway 16 is provided in the machine body 1, and the crosshead 4 is arranged in the crosshead slideway 16 and reciprocates along the crosshead slideway 16. Integrating the crosshead slideway 16 on the machine body 1 is convenient for assembly and disassembly, and can ensure reliable reciprocating motion of the crosshead 4.

[0047] like Figure 4 As shown, the left and right ends of the body 1 are respectively provided with connecting plates 17 connected to the hydraulic end 20 to achieve quick and convenient disassembly and assembly with the hydraulic end 20 .

[0048] In this embodiment, the transmission end body 1 is an integral structure, which is integrally processed and formed, has good rigidity, low cost, and no sealing problem.

[0049] The above description is only a preferred embodiment of the present application and an explanation of the applied technology. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) and the technical solution formed.

[0050] In addition, although each operation is described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or to be performed in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the application. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0051] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. An opposed reciprocating pump, characterized in that: It includes a transmission end and a hydraulic end arranged on the left and right sides of the transmission end, the transmission end includes a body, a crankshaft, a connecting rod and a crosshead, the crankshaft, the connecting rod and the crosshead are installed on the body, the crankshaft includes a plurality of cranks, each of the cranks is installed with two connecting rods, the two connecting rods extend along the left and right sides of the crankshaft respectively and are connected to the crossheads located on the left and right sides of the crankshaft, and the crosshead is connected to the plunger corresponding to the hydraulic end.

2. The opposed reciprocating pump according to claim 1, characterized in that: The big end of the connecting rod is connected to the crankshaft through a bearing bush, and the small end of the connecting rod is connected to the crosshead through a pin shaft.

3. The opposed reciprocating pump according to claim 1, characterized in that: The machine body is provided with a crankshaft hole for installing the crankshaft, and the crankshaft hole includes a first crankshaft hole arranged at the front and rear ends of the machine body and at least one second crankshaft hole arranged in the machine body, an end bearing seat is arranged at the first crankshaft hole, and an intermediate bearing seat is arranged in the machine body, and the intermediate bearing seat has the second crankshaft hole.

4. The opposed reciprocating pump according to claim 3, characterized in that: The crankshaft is connected to the end bearing seat through an end bearing, and the crankshaft is connected to the intermediate bearing seat through an intermediate bearing. The end bearing is a spherical roller bearing, and the intermediate bearing is a floating cylindrical roller bearing.

5. The opposed reciprocating pump according to claim 4, characterized in that: An expansion sleeve is also provided between the crankshaft and the end bearing.

6. The opposed reciprocating pump according to claim 4, characterized in that: The intermediate bearing seat is a semi-arc structure and is arranged on one side of the crankshaft. The body also includes a bearing cover arranged on the other side of the crankshaft. The bearing cover is docked with the intermediate bearing seat and connected to the intermediate bearing.

7. The opposed reciprocating pump according to claim 1, characterized in that: The phase angles of the plurality of cranks are different.

8. The opposed reciprocating pump according to claim 1, characterized in that: The large end of the connecting rod is an obliquely split structure.

9. The opposed reciprocating pump according to claim 1, characterized in that: A crosshead slideway is provided in the machine body, and the crosshead is arranged in the crosshead slideway and reciprocates along the crosshead slideway.

10. The opposed reciprocating pump according to claim 1, characterized in that: The left and right ends of the machine body are respectively provided with connecting plates connected to the hydraulic end.

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